The inﬂuence of Al:Nb ratio on the microstructure and mechanical response of quaternary Ni–Cr–Al–Nb alloys
Materials Science and Engineering: A
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Mignanelli, P., Jones, N., Hardy, M., & Stone, H. (2014). The inﬂuence of Al:Nb ratio on the microstructure and mechanical response of quaternary Ni–Cr–Al–Nb alloys. Materials Science and Engineering: A, 612 179-186. https://doi.org/10.1016/j.msea.2014.06.021
The influence of Al:Nb ratio on the microstructure and properties of Ni–Cr–Al–Nb alloys has been investigated following long-term exposure at elevated temperatures. The γ′ volume fraction, size and lattice misfit were seen to increase with a larger Al:Nb ratio, although these changes resulted in reduced hardness. The change in the critical resolved shear stress (CRSS) associated with strong dislocation coupling was determined to be the dominant strengthening mechanism and increased with decreasing Al:Nb ratio. A distribution of tertiary γ′ was observed to be necessary in maximising the mechanical properties of these alloys.
Nickel-based superalloys, Microstructure, Gamma prime, Ageing, Electron microscopy
This work was supported by the EPSRC/Rolls-Royce Strategic Partnership (EP/H022309/1 and EP/H500375/1).
UNIVERSITY OF BIRMINGHAM (FB EPSRC) (EP/H022309/1)
External DOI: https://doi.org/10.1016/j.msea.2014.06.021
This record's URL: https://www.repository.cam.ac.uk/handle/1810/245411
Attribution 2.0 UK: England & Wales, Creative Commons Attribution License 2.0
Licence URL: http://creativecommons.org/licenses/by/2.0/uk/
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